diff --git a/radio/src/datastructs.h b/radio/src/datastructs.h
index a0571ac61..213d9cc4d 100644
--- a/radio/src/datastructs.h
+++ b/radio/src/datastructs.h
@@ -329,10 +329,10 @@ PACK(struct TelemetrySensor {
     NOBACKUP(uint16_t persistentValue);
   };
   union {
-    PACK(struct {
+    NOBACKUP(PACK(struct {
       uint8_t physID:5;
       uint8_t rxIndex:3; // 1 bit for module index, 2 bits for receiver index
-    }) frskyInstance;
+    }) frskyInstance);
     uint8_t instance;
     NOBACKUP(uint8_t formula);
   };
@@ -941,4 +941,4 @@ static inline void check_struct()
 
 #undef CHKSIZE
 }
-#endif /* BACKUP */ 
\ No newline at end of file
+#endif /* BACKUP */ 
diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index b1a01e2e1..7bed170cf 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -310,7 +310,7 @@ if(PYTHONINTERP_FOUND)
   add_custom_command(
     OUTPUT ${PROJECT_BINARY_DIR}/radio/src/datacopy.cpp
     WORKING_DIRECTORY ${RADIO_DIRECTORY}/src
-    COMMAND ${PYTHON_EXECUTABLE} ${RADIO_DIRECTORY}/util/generate_datacopy.py datastructs.h -DPCBHORUS -DPCBX10 -DCPUARM -DSTM32F4 -DSTM32F429_439xx -DCOLORLCD -DBACKUP -DSIMU -I. -Itargets/horus -Itargets/common/arm/stm32 -I${THIRDPARTY_DIR} -I${THIRDPARTY_DIR}/STM32F4xx_DSP_StdPeriph_Lib_V1.4.0/Libraries/CMSIS/Device/ST/STM32F4xx/Include ${arm_gcc_include_path} > ${PROJECT_BINARY_DIR}/radio/src/datacopy.cpp
+    COMMAND ${PYTHON_EXECUTABLE} ${RADIO_DIRECTORY}/util/generate_datacopy.py datastructs.h -DPCBHORUS -DPCBX10 -DCPUARM -DSTM32F4 -DSTM32F429_439xx -DCOLORLCD -DBACKUP -DSIMU -I. -Itargets/horus -Itargets/common/arm/stm32 -I${THIRDPARTY_DIR} -I${THIRDPARTY_DIR}/STM32F4xx_DSP_StdPeriph_Lib_V1.4.0/Libraries/CMSIS/Device/ST/STM32F4xx/Include > ${PROJECT_BINARY_DIR}/radio/src/datacopy.cpp
     DEPENDS ${RADIO_DIRECTORY}/src/datastructs.h ${RADIO_DIRECTORY}/util/generate_datacopy.py
     )
   add_custom_target(datacopy